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P0171 Diagnostic Trouble Code Discussion for June 2009

Fuel System Lean (Bank 1) *

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Trouble Ticket Help Requests for DTC P0171

	Help Request	Posted
	1999 Ford Ranger XLT 4.0L Poor Idle Quality, Hesitation, Surge, MIL Lamp on VIN: 1FTZR15X1X P0171: system to lean bank 1. I have this 99 ford ranger with the 4.0L in my shop and im having a hard time getting to the bottom of this one. I pull the 2 lean codes for both banks, reset the light and codes do come back after 2 drive cycles. First step I took was replace the fuel filter ...	June 02, 2009
	2001 Infiniti QX4 3.5L Excessive Emissions, MIL Lamp on VIN: JNRDR07X11 P0171: Fuel Trim Lean (Bank 1). o2 sensors switch good at cruise. At idle o2 voltage on both banks at .95. Fuel trim is at 100%. Maf tests good but I still suspect its faulty. I used to like being single, thanks in advance for looking.	June 04, 2009
	2002 Toyota Highlander 3.0L Misfire VIN: JTEHF21A52 P0171: Fuel System Too Lean (Bank 1). ... check engine light. Found a consistent code P0171 for lean exhaust and no sign of symptom and fuel trim appeared normal under ALL conditions. Days later codes for all three bank#1 cylnders (1,3,& 5) showed misfire code...	June 09, 2009
	2002 Subaru Impreza WRX 2.0L Poor Idle Quality, Hesitation, Misfire, MIL Lamp on VIN: JF1GD29632 P0171: Fuel System Too Lean (Bank 1). subaru tech, please help on this one. car came in with system too lean and misfire code. LTFT 14.8% STFT 17.2% road test vehicle, car loss power, turbo doesn't kick in like the way it suppose [...] be.fuel trim keep going up after we erease dtc. install smoke ...	June 12, 2009
	1999 Ford Explorer Sport 4.0L MIL Lamp on VIN: 1FMYU24E4X P0171: system to leab bank1. took everyones advice and put intake gaskets on but did not fix.stft b1 12.48 ltft b1 24.96 stft b2 3.12 ltft b2 24.18 coolant temp 79c. calc load 56%. rpm2073. front [...] good rear o2 one at.3 other at.7 no fluctuation. fuel system is returnless.my question ...	June 14, 2009
	2000 Lincoln LS 3.9L lack of power VIN: 1LNHM87AXY P0171: system too lean bank 1. ... was not working. The door panel was removed and the window regulator was found broken. The driver's side window regulator was replaced and the window was working fine. The customer said the next day the window was not working when the door was shut but it ...	June 15, 2009
	1999 Ford Expedition Eddie Bauer 5.4L Poor Idle Quality, Misfire VIN: 1FMPU18L1X P0171: lean. ... pin pointing 2 coils and 1 injector truck ran fine except at idle. after driving a while p0171 and 174 popped on. looked at o2 sensors on modis and both upstream sensors were pegged lean. decided to clean maf to see any di...	June 16, 2009
	2006 Chrysler Pacifica 3.5L Hesitation VIN: 2C4GM68405 P0171: Fuel System Lean (Bank 1). ... with a p0171. customer said it hesitates and cuts out. We have looked at fuel trim(short term between -3 and 0) long term( about 2)it has good fuel pressure and have not found and vac leaks. we have been driving for 3 days without any problem. these is the...	June 17, 2009
	1999 Ford Expedition Eddie Bauer 5.4L Poor Idle Quality, Misfire VIN: 1FMPU18L1X P0171: lean. ... pin pointing 2 coils and 1 injector truck ran fine except at idle. after driving a while p0171 and 174 popped on. looked at o2 sensors on modis and both upstream sensors were pegged lean. decided to clean maf to see any di...	June 17, 2009
	2003 Ford Focus SE 2.3L Hesitation, Surge, Cuts out, Stall, MIL Lamp on VIN: 1FAFP34Z63 P0171: system too lean bank 1. Greetings. customer states that there is a clicking noise from under dash near feet/fuse panel area, car loses power, all dash warning lights come on, and heater comes on by itself. After sitting overnight the car starts and runs fine. Customer states after dr...	June 19, 2009
	2001 Chevrolet Prizm 1.8L MIL Lamp on VIN: 1Y1SK528X1 P0171: system to lean. hello out there i have a car here that i am stumped on. this car came in with a cat efficiency code and a po171 system lean code. we replaced the cat and cleard the code and shiped it. it came back with the po171 code the freeze frame indecated that the code w...	June 22, 2009
	2000 Toyota Celica GT 1.8L MIL Lamp on VIN: JTDDR32T4Y P0171: Fuel System Too Lean (Bank 1). vehicle has code 171 lean condition long term fuel trim -19 short term fuel trim fluctuates + and - mass air flow 2 grams which seems low tried a new one same readings and cant find a vacuum leak ran propane over every thing got any suggestions guys thanks	June 22, 2009
	1999 Ford Ranger XLT 4.0L Poor Idle Quality, Hesitation, Poor Fuel Economy, MIL Lamp on VIN: 1FTZR15X1X P0171: system to lean bank 1. I have this 99 ranger with a 4.0l in my shop and the check engine light keeps coming on with lean codes on both banks. From doing a little research I was pointing twords the lower intake and injecter gaskets but after checking fuel pressure im now thinking a w...	June 23, 2009
	2000 Toyota Celica GT 1.8L MIL Lamp on VIN: JTDDR32T4Y P0171: Fuel System Too Lean (Bank 1). vehicle has code 171 lean condition long term fuel trim -19 short term fuel trim fluctuates + and - mass air flow 2 grams which seems low tried a new one same readings and cant find a vacuum leak ran propane over every thing got any suggestions guys thanks	June 23, 2009
	2004 Volkswagen Passat GLS 1.8L Poor Idle Quality, Misfire, MIL Lamp on VIN: WVWPD63B14 P0171: Lean bank 1. Vehicle Came in With Rough Idle. Runs Fine while Driving. First Thing I Saw was the oil filter was pouring oil out of it. Turned out to be the wrong filter. Second Checked All Coils and all were firing and all are updated. Installed New NGK Laser Plugs. Remove...	June 23, 2009
	2004 Volkswagen Passat GLS 1.8L Poor Idle Quality, Misfire, MIL Lamp on VIN: WVWPD63B14 P0171: Lean bank 1. Vehicle Came in With Rough Idle. Runs Fine while Driving. First Thing I Saw was the oil filter was pouring oil out of it. Turned out to be the wrong filter. Second Checked All Coils and all were firing and all are updated. Installed New NGK Laser Plugs. Remove...	June 26, 2009
	2004 Chevrolet Suburban 1500 LS 5.3L Cuts out, Stall VIN: 3GNFK16Z44 P0171: Fuel Trim System Lean (Bank 1). Please help! I have this '04 Chev. Suburban, 5.3l "Z" engine with a problem that shows up intermittently. After driving at least 20-30 min., the car hesitates and lugs on acceleration, and will eventually stall. With a fuel pressure gage hooked up, whe...	June 29, 2009
	2000 Toyota Corolla VE 1.8L Hesitation, MIL Lamp on VIN: 2T1BR12E8Y P0171: Fuel System Too Lean (Bank 1). ... sensor cleaned 02 sensor has been replaced no vac leaks found long term fuel trim 12.5 short term 1.6 short term b1s1 0.8 the muffler was replaced veh had heistation and lack of power problem 02 sensor was removed veh was take for a test run power was rest...	June 29, 2009
	2001 Toyota Corolla CE 1.8L Excessive Emissions, MIL Lamp on VIN: INXBR12E81 P0171: Fuel System Too Lean (Bank 1). this vehicle came in with a code p0171 lean condition code. customer was concerned that the check engine light was on, but didnt notice any difference in the vehicle with running issues. i have checked for vacuum leaks with a smoke machine, cleaned the maf (lo...	June 29, 2009